/Engine/Source/Runtime/Engine/Classes/Materials/MaterialFunctionInstance.h
Iterates all functions that this function is dependent on, directly or indrectly.
true if all dependent functions were visited, false if the Predicate did break iteration
virtual bool IterateDependentFunctions ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool([UMaterialFunctionInterface](API\Runtime\Engine\Materials\UMaterialFunctionInterface) *)> Predicate ) const